 /*******************************************************************************
  * Copyright (c) 2004, 2005 IBM Corporation and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
  * http://www.eclipse.org/legal/epl-v10.html
  *
  * Contributors:
  * IBM Corporation - initial API and implementation
  *******************************************************************************/
 package org.eclipse.ui.internal.commands;

 import org.eclipse.core.commands.CommandEvent;
 import org.eclipse.core.commands.ICommandListener;
 import org.eclipse.jface.bindings.BindingManager;
 import org.eclipse.ui.commands.ICommand;

 /**
  * Wraps a legacy listener in a new listener interface. This simply forwards
  * incoming events through to the old interface.
  *
  * @since 3.1
  */
 final class CommandListenerWrapper implements ICommandListener {

     /**
      * The supporting binding manager; never <code>null</code>.
      */
     private final BindingManager bindingManager;

     /**
      * The listener which is being wrapped. This value should never be
      * <code>null</code>.
      */
     private final org.eclipse.ui.commands.ICommandListener listener;

     /**
      * Constructs a new instance of <code>CommandListenerWrapper</code> around
      * a legacy listener.
      *
      * @param listener
      * The listener to be wrapped; must not be <code>null</code>.
      */
     CommandListenerWrapper(
             final org.eclipse.ui.commands.ICommandListener listener,
             final BindingManager bindingManager) {
         if (listener == null) {
             throw new NullPointerException ("Cannot wrap a null listener."); //$NON-NLS-1$
 }

         if (bindingManager == null) {
             throw new NullPointerException (
                     "Cannot create a listener wrapper without a binding manager"); //$NON-NLS-1$
 }

         this.listener = listener;
         this.bindingManager = bindingManager;
     }

     /*
      * (non-Javadoc)
      *
      * @see org.eclipse.commands.ICommandListener#commandChanged(org.eclipse.commands.CommandEvent)
      */
     public final void commandChanged(final CommandEvent commandEvent) {
         final ICommand command = new CommandWrapper(commandEvent.getCommand(),
                 bindingManager);
         final boolean definedChanged = commandEvent.isDefinedChanged();
         final boolean descriptionChanged = commandEvent.isDescriptionChanged();
         final boolean handledChanged = commandEvent.isHandledChanged();
         final boolean nameChanged = commandEvent.isNameChanged();

         listener.commandChanged(new org.eclipse.ui.commands.CommandEvent(
                 command, false, false, definedChanged, descriptionChanged,
                 handledChanged, false, nameChanged, null));

     }

     public final boolean equals(final Object object) {
         if (object instanceof CommandListenerWrapper) {
             final CommandListenerWrapper wrapper = (CommandListenerWrapper) object;
             return listener.equals(wrapper.listener);
         }

         if (object instanceof org.eclipse.ui.commands.ICommandListener) {
             final org.eclipse.ui.commands.ICommandListener other = (org.eclipse.ui.commands.ICommandListener) object;
             return listener.equals(other);
         }

         return false;
     }

     public final int hashCode() {
         return listener.hashCode();
     }
 }

